摘要
采用ABAQUS有限元软件建立覆冰导线有限元模型，利用用户材料子程序VUMAT定义覆冰本构模型和删除破坏单元，实现冲击载荷作用下导线除冰过程的模拟。覆冰采用多孔弹性模型，并考虑温度和孔隙率对其力学性能的影响；引入拉伸破坏准则判断覆冰的破坏。对不同档数、档距、覆冰孔隙率、覆冰厚度、除冰时的温度、冲击载荷大小等情况下除冰过程的模拟分析表明，较小范围温度的变化对除冰率的影响很小，而其它因素对除冰效果的影响明显，在设计机械式冲击除冰装置时应予以考虑。
Abstract
A numerical model, consisting of adjacent spans and insulator strings, of a multi-span iced transmission line section is set up in ABAQUS software. The user-defined material subroutine VUMAT of ABAQUS software is developed for the introduction of porous elastic constitutive model of the ice and the deletion of pipe elements used to model the broken ice with the tensile failure criterion. A large number of de-icing scenarios are studied with variables including number of spans per line section, span length, ice porosity, ice thickness, temperature and different amplitudes of shock-loads, based on which the effects of adjacent span and insulator strings on the rate of de-icing are analyzed and discussed. It is discovered that the process of de-icing after loading is affected obviously by all the above parameters except temperature. The obtained numerical results provide a reference for the design of de-icing technique in practice.
关键词
覆冰导线 /
除冰 /
冲击载荷 /
数值模拟
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Key words
Iced conductor /
de-icing /
shock-load /
numerical simulation
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陈科全 严波 刘小会 程皓月.
覆冰导线机械式冲击除冰模拟研究[J]. 振动与冲击, 2012, 31(17): 129-133
Chen Ke-quan Yan Bo LIU Xiao-hui CHENG Hao-yue.
Numerical Study on Mechanical De-icing for Iced Transmission Lines[J]. Journal of Vibration and Shock, 2012, 31(17): 129-133
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脚注
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